Published in Women's Health Weekly, March 20th, 2003
The study asked women between the ages of 40 and 85 how much physical activity they took part in at 2, 10 and 20 years prior to the interview and at age 16.
Findings showed the strongest protective effect from strenuous exercise at a point 20 years in the past. All women who reported an average of 3.5 hours per week of sweat-producing physical activity at that point in their lives cut their risk of developing breast cancer later in life in half.
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